Figure 4.

The influence of Coulomb interactions on the spectra of 〈n2s〉. The relevant parameters are taken to be V1 = 0.5, V2 = 0.1, and . (a) The spectrum of 〈n2s〉 vs ϵ1 and ϵ2. The Coulomb interactions are taken to be U1 = U2 = 1.0. (b) The spectrum of 〈n2s〉 with U1 = 3.0 and U2 = 1.0. (c) The curve of 〈n2s〉 vs ϵ2 with U1 = U2 = 3.0. The level of QD-1 is taken to be ϵ1 = 0 and ±0.5, respectively.